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As with most if not all cities in Japan, Kanazawa is a very safe place to visit. The central crossing in Kanazawa`s Katamachi area known locally as the Scramble can get a bit rowdy on the weekends. The worse that is likely to happen is a snide comment or two. The usual common sense rules apply and single female travellers would be wise to keep their wits about them at night-time.
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English is not as widely spoken as in other bigger cities and many restaurants will only have a Japanese menu. A big smile and a bit of patience will work wonders in these cases. In many cases, the waitperson can probably speak some English if you give them a chance to get over their nervousness.